Machine for grinding metal surfaces



A.. DAMS.' MA CHINE' FURv GRIND'IN-G' METAL "SURFACE lS'.

Patented 00u27, 1885.

' UNITED .STATES PATENT OFFICE.

ALFRED DAWES, oF EoSToN, MASSACHUSETTS.

MACHINE FOR GRINDING METAL SURFACES.

SPECIFICATION forming part of Letters Patent No. 329,289, dated October'27, 1885.

Application tiled November 10, 18H4. Serial No. 147,475. (No model.)

' the dovetailed slide e, and mounted loosely To all whom, it mayconcern:

Beit known that I, ALFRED DAWES, of Boston, (Ohelsea,) in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Machines for Grinding Metal Surfaces, of which thefollowment, and combinations of parts, which will base broken away.

be readily understood by reference to the description of thedrawings,and to the claims, to be hereinafter given.

Figure 1 of the drawings is a side elevation of a machine embodying myinvention. Fig. 2is a front end elevation of the same with the sectionthrough the grinding-wheel and work carriage or table. Fig. 4 is a planof the work carriage or table and the gage; and Fig. 5 is a verticaltransverse section of the bed on line w a; on Fig. 1, looking toward theplate L.

A is the bed O f themachine,supported upon the column B, provided withthe base-flange B', by which the machine may be firmly secured inposition upon a bench,or to the floor of the building, in which lattercase the column B would be made of sufficient height to raise thegrinding-wheel to a convenient position for operation. The bed A is madehollow and slotted at top and bottom in a wellknown manner, and hasiirmly secured thereon,directly over the column B, the head-stock C, inthe bearings C C of which is mounted the shaft D, having secured thereonthe driving-pulley E,as a means of imparting thereto the desired rotarymotion. Upon one or both ends of the'shat't D is mounted agrindingwheel, F, composed of the metal lap or holder a and theemery-disk b, the holder a being provided with the annular lip a', toinclose a portion of the thickness of the emerydisk b, which is securedto the holder a by a film of cement, c, interposed between said disk andholder, as shown in Fig. 3.

G is a tail-stock or stand adj ustabl y secured upon the bed A in frontof the grinding-Wheel F, and carrying between its two upright ears orcheeks,d and d,the semi-cylindrical bed For support H, provided upon itsupper Side with Fig. 3is a partial vertical'v upon the axial bolt orshaft I, set in the ears or cheeks d and d', with its axis parallel withthe radial face of the emery-disk b.

J is the'work-supporting carriage or bed,t ted to and movable endwiseupon the dovetailed slide e, as shown in Fig. 3. The cheeks d and d ofthe tail-stock G are each provided with a curved Slot, j', madeconcentric with the center of the bolt I, through which passes theclamping-bolt g,which screws into the end of the semi-cylindricalsupport H as a means l ofadjusting the upper surface of the carriage orbed J to any desired angle to the radial face of the grinding-Wheel. h,is fitted to a hole in the cheek d, and enters a corresponding hole inthe head of the sup- .port H, for the purpose of accurately registeringsaid support in a position with the upper surface of the carriage Jexactly at right angles to the radial face ot the grinding-wheel, asshown in Fig. 1, said pin h being removed when it is desired to set thecarriage J at any o other angle t'o the face of t-he grinding-Wheel.

An index-plate, z', is secured to the front edge of the cheek d, theupper end of which has formed thereon the horizontal knife-edge i', bymeans of which, acting in conjunction with the graduated scale j ou thecontiguous curved front surface of the support H, said support may beset at any desired angle with great facility and accuracy.

K is a handle attached to the carriage J, by which said carriage may bereci procated upon the slide e during the operation of grinding.

A nice adjustment of the work toward or from the grinding-wheel may beobtained by means of the set-screw k, mounted in the upper end of theadjustable plate L, the inner end of the screw 7c abutting against theouter end of the tail-stock or stand G, as shown in Fig. 1. The plate Lis provided with the slot Z to A register-pin,

receive the guide-pin m, fixed in the end of the bed A, and theclamping-bolt u, which screws into the end of said bed to clamp saidplate in its most elevated position, and by unscrewing orslackenin'gwhich, said plate L may be depressed till its upper end is on a linewith or below lthe upper surface of the bed A, the screwk dropping intothe longitudinal slot in the upper surface of the bed, A and below theunder surface of the tail-stock IOO at right angles to the radial faceol' the grinding-wheel, or at any desired angle between that andforty-five degrees. rlhis could readily Avbe accomplished by a simplemovement of said gage around a fixed fulcrum-pin passing through a holein said gage which it lled, and clamping it by a bolt passingA through asegmental slot the curve of which is concentric with the axis of saidpivot; but in such case, when the gage is moved into any other positionthan at rightA angles to the front and rear edges of the carriage J, thepointrof` said gage will recede from therear edge of said carriage. Forsome kinds of light work it is very desirable that in whatever positionthe gage is placed its point r should extend to the rear edge ofthegcarriage J, and to accomplish this I form in the gageN aslot, s,extending parallel wit-h the edge p of said gage, through which slot thefulcrum-pin s passes andV is screwed into the carriage J. I also iorm inthe opposite end of the gage N the segmental slot t, the curve of whichis eccentric to the axis of the pin s', through which slot theclamping-bolt t passes and is screwed into the carriage J. By means ofthis construction and-.arrangement ofthe slots s and tand the fulcrumpins 'and bolt t", if the front or outer end of the gage N be moved to theright, or so that the slot t in said gage traverses the bolt t', theslot s will be 'made to traverse the pin s', and the point o' oi' thegage will be maintained in line with the rear or inner edge of thecarriage J, as indicated in dotted lines in Fig. 4. Aportion of theouter edge of the gage N is beveled, and has a scale of degrees, a,marked thereon, which, in connection with the index-mark u', formed uponthe carriage J, serves to facilitate the accurate adjustment of the gageto the desired angle.

Two register-pins, c v, are' nicely fitted to holes in vsaid gage, andcorresponding holes 5o in the carriage J, as a means of greater securityin holding the gage in place when set at right angles to the front andrear edges of the carriage J.

One or more threaded holes, w w, are formed in the carriage J to receivea clampbolt for securing thereto the ordinary machinists clamp forholding the work in position on the carriage. As this clamp forms nopart of my present invention, it is not represented in the drawings, andneeds no further description here.

0 is a sheet metal plate secured to the back edges of the cheeks d andd', and provided with the foot O', covering the top of the bedimmediately beneath the grindingwheel, the whole being designed toprevent the grit and dirt from the grinding-wheel getting into thebearings or working parts of arranged to be reciprocated by hand; but itsired, and..in 'some cases I intend to apply mechanism thereto to imparta positive and regular reciprocation thereto.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. The combination,in a grinding-machine, of the grinding-wheel F, thetail-stock G, provided with the upwardly-projecting ears or cheeks d andd', and having formed in one of said cheeks the curved slot f, thesemi-cylindrical bed H, provided upon its upper surface with thedovetailed slide e, the shaft I, mounted at each end in said cheeks, andextending longitudinally through said bed, con'- centric to itssemi-cylindrical periphery, and the rectangular work supporting table J,having aplain'iiat upper surface, to receive the work to be ground, andprovided with the handle K, and fitted to and movable upon clamping-boltg, all arranged and adapted to operate substantially as described. Y

2. The combination of the bed A, the tailstock G, provided with theupwardly-projecting ears ,or cheeks d d', and the curved slot f, thesemi-cylindrical or D-shaped bed H, providedgwith a dovetailed slideupon its upper surface, and a graduated scale' upon its curvedperipheral surface, near one'end thereof, the bolt g, for clamping saidbed H in the desired position, the index i on t-he front of the cheek d,and coinciding with the periphery of the bed H, and the table J, havinga flat upper surface and made rectangular in plan, and of a length equalto the length of the bed II, plus the desired movement to be given.thereto, substantially as shown and described.

3. In combination with the tail-stock G and bed A, the set-screw 7cv andthe adjustable plate L, arranged and adapted to operate substantially asdescribed.

4.. The gage N, provided with the slots s and t, in combination with thecarriage J, lthe fulcrum-pin s', and the clamping-bolt t,- allconstructed and arranged to operate substantially as described.

5. The gage N, provided with the slots .s and t, and the scale ofdegrees u, in combination with the carriage J, the fulcrunrpin s', theclamping-,bolt t', and the index u', all arranged and adapted to operatesubstantially as described. i

In testimony whereof I have signed my /name to this specification, inthe presence of November, A. D. 1884. i

ALFRED DAWES.

Witnesses:

N. C. LOMBARD, WALTER E. LOMBARD.

the machine. In the drawings the carriage J is shown as may bereciprocated automatically, if dethe dovetailed slide on said bed H, andthe IIO two subscribing witnesses, on this 7th day of

